We are in a self-build with 4 * 200 ah lithium batteries, 3000w inverter, a 60 amp B2B charger (dual 250a alternators), and 600 watts solar.
We just completed a 10 day Florida-Texas-Florida trip (lots of sun), used 12 volt A/C every night, hot water, induction cooking + microwave, and did not plug in one time. I only ran the B2B charger a couple of times on cloudy days. Most days the solar was enough to restore the batteries before noon.
If you go DIY, it is still expensive but doable. The batteries are around $750 each, Victron Multiplus-ii is about $1350, B2B charger $200. Add cables, bus bars, fuses, and disconnects, and it is coming in around $5000. Solar panels, plus MPPT might add another $1500?, depends on panels, layout, brackets, etc. I’ve started a blog on the build process and components, but it is not ready yet.
Hot water electrical performance
It took just over 10 minutes to heat 6 gallons of hot water.
